DOM mouse scroll stuff

by someprimetime

HTML

<body>
        <h1 id="banner">jQuery mousewheel.js - Test</h1>
        <h2 id="userAgent"></h2>
        
        <ul>
            <li><strong>Test2</strong> should prevent the default action.</li>
        </ul>
        
       
        <div id="test2"><p>Test2</p></div>
        
        <div id="logger"></div>
        
        <div id="forceScroll"></div>
    </body>

CSS

#test1 {
                background-color: #000;
                width: 120px;
                height: 100px;
                color: #fff;
                float: left;
            }
            
            #test2 {
                background-color: #333;
                width: 120px;
                height: 100px;
                color: #fff;
                float: left;
            }
            
            #forceScroll {
                clear: both;
                height: 1000px;
            }
            
            #logger {
                position: absolute;
                top: 395px;
                left: 12px;
                width: 460px;
                height: 290px;
                overflow: auto;
            }
            
            #logger p {
                font-family: Arial, sans-serif;
                font-size: 13px;
                padding: 2px;
                border-bottom: 1px solid #ccc;
                margin: 0;
            }
            
            #logger p:nth-child(even) {
                background-color: #FFFFE8;
            }
            
            #logger p:nth-child(10n) {
                border-bottom-color: #000;
            }

JavaScript

/*! Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
 * Thanks to: Seamus Leahy for adding deltaX and deltaY
 *
 * Version: 3.0.6
 * 
 * Requires: 1.2.2+
 */

(function($) {

    var types = ['DOMMouseScroll', 'mousewheel'];

    if ($.event.fixHooks) {
        for (var i = types.length; i;) {
            $.event.fixHooks[types[--i]] = $.event.mouseHooks;
        }
    }

    $.event.special.mousewheel = {
        setup: function() {
            if (this.addEventListener) {
                for (var i = types.length; i;) {
                    this.addEventListener(types[--i], handler, false);
                }
            } else {
                this.onmousewheel = handler;
            }
        },

        teardown: function() {
            if (this.removeEventListener) {
                for (var i = types.length; i;) {
                    this.removeEventListener(types[--i], handler, false);
                }
            } else {
                this.onmousewheel = null;
            }
        }
    };

    $.fn.extend({
        mousewheel: function(fn) {
            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
        },

        unmousewheel: function(fn) {
            return this.unbind("mousewheel", fn);
        }
    });


    function handler(event) {
        var orgEvent = event || window.event,
            args = [].slice.call(arguments, 1),
            delta = 0,
            returnValue = true,
            deltaX = 0,
            deltaY = 0;
        event = $.event.fix(orgEvent);
        event.type = "mousewheel";

        // Old school scrollwheel delta
        if (orgEvent.wheelDelta) {
            delta = orgEvent.wheelDelta / 120;
        }
        if (orgEvent.detail) {
            delta = -orgEvent.detail / 3;
   ...